get/set clipboard, color hex value

src/node_dialog_picker.h

@@ -24,6 +24,9 @@ public:
     NodeBorder* m_color_old;
     NodeBorder* m_color_old1;
     NodeBorder* m_color_old2;
+    NodeButton* m_btn_copy;
+    NodeButton* m_btn_paste;
+    NodeText* m_txt_hex;
     glm::vec3 m_rgb;
     glm::vec3 m_hsv;
 
@@ -35,6 +38,7 @@ public:
     virtual kEventResult handle_event(Event* e) override;
     virtual void added(Node* parent) override;
     void init_controls();
+    void update_hex(glm::vec3 rgb);
     void set_color(glm::vec3 rgb);
     glm::vec3 get_hsv() const;
     glm::vec3 get_rgb() const;